CAJ | 학술논문

针对已完成精加工的不锈钢堆焊密封面上钻孔，将不锈钢堆焊层钻穿，致使与底部低合金钢相通，给耐蚀容器使用带来极大隐患的事故，介绍一种小直径孔底修复工艺，采用填充同材质金属堵，再加自动氩弧焊，使表面自熔熔深大于2 mm的密封焊工艺。该工艺能避免常规的预热，焊后热处理、密封面研磨等修复工序，极大地降低了生产成本，加快生产进度。使用该工艺完成的全部12个螺纹孔底密封焊，经液体渗透检验合格，并通过业主和第三方监造联检验收，孔内螺纹和密封面无一损伤，实现了预期的目标。
침대이완성정가공적불수강퇴한밀봉면상찬공，장불수강퇴한층찬천，치사여저부저합금강상통，급내식용기사용대래겁대은환적사고，개소일충소직경공저수복공예，채용전충동재질금속도，재가자동아호한，사표면자용용심대우2 mm적밀봉한공예。해공예능피면상규적예열，한후열처리、밀봉면연마등수복공서，겁대지강저료생산성본，가쾌생산진도。사용해공예완성적전부12개라문공저밀봉한，경액체삼투검험합격，병통과업주화제삼방감조련검험수，공내라문화밀봉면무일손상，실현료예기적목표。
Drilling operation was performed wrongly on the final machined surfaces of the stainless steel clad-welded layer. The drillings are through the layer and into the base alloy steel, which brings considerably safety risk for the operation of anti-corrosion vessels. The paper introduces a procedure to repair the bottom of small-diameter drillings. The procedure is to weld a plug in the material same with filler metal by the means of automatic argon-ace welding technique to make the plug surface fuse over 2 mm deep to seal the base metal. This procedure does not need conventional preheating, post-weld heat treatment, and sealing surface grinding and other repair processes. So, the manufacture cost reduces significantly and the manufacture can make progress greatly. The seal welds on 12 thread drillings that are repaired with this procedure all has past PT examination successfully and are accepted by the owner and third-party inspection agency. No damage happens on the thread and sealed face in the drillings. The expected target has been reached.